diff --git a/requirements.txt b/requirements.txt
index 5dbd11d..981ea1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -70,7 +70,7 @@ mistune==0.8.4
 mpmath==1.1.0
 nbconvert==5.6.1
 nbformat==5.0.4
-notebook==6.0.3
+notebook==6.4.1
 numpy==1.17.3
 opt-einsum==3.1.0
 optuna==1.2.0